VITAMIN D deficiency symptoms include muscle pain, excessive sweating, and often developing a cold. But you could also be at risk of deficiency signs, and should add more vitamin D foods to your diet, if your hair looks like this.

“Vitamin D works alongside a number of different vitamins and minerals, including iron, vitamin C and biotin, which are all vital in the hair growth cycle, so gaining a better understanding of all these elements will shed more light into the connection.”